My water on the door stopped?

The water at the door of my GE 4 year old fridge stopped a few months ago. I have a well with very clean water and did not install an external filter when it was installed. Do not know if there is an internal filter the book is very vague and covers many models. I think I can hear the solenoid pick when the switch is pushed. Mod # GSS20GEWJ BB Any help?

Jerry D
August 2013